CVE-2026-0750 is a vulnerability classified under CWE-347, indicating improper verification of cryptographic signatures within the Drupal Commerce Paybox module for Drupal 7.x. This module handles payment processing via the Paybox gateway, and the flaw allows attackers to bypass authentication mechanisms by exploiting the incorrect validation of cryptographic signatures. Specifically, the vulnerability affects versions from 7-x-1.0 through 7-x-1.5 of the module. The improper signature verification means that an attacker can craft malicious requests that appear legitimate to the system, thereby gaining unauthorized access without needing valid credentials or user interaction. The CVSS 4.0 base score of 8.7 reflects a high severity, with an attack vector of network (AV:N), no required privileges (PR:N), no user interaction (UI:N), and no confidentiality or availability impact but high integrity impact (VI:H). This means the attacker can manipulate or bypass authentication controls remotely, potentially leading to fraudulent transactions or unauthorized administrative actions within the e-commerce environment. No patches or exploits are currently publicly available, but the vulnerability is officially published and should be addressed promptly. The Drupal Commerce Paybox module is widely used in Drupal 7.x deployments for e-commerce, making this a significant risk for affected sites.

For European organizations, especially those operating e-commerce platforms using Drupal 7.x with the Commerce Paybox module, this vulnerability poses a substantial risk. Successful exploitation could lead to unauthorized access to payment processing functions, enabling fraudulent transactions, manipulation of order data, or unauthorized administrative actions. This compromises the integrity of financial operations and could result in financial losses, reputational damage, and regulatory penalties under GDPR due to failure to protect payment data. The lack of required authentication and user interaction increases the likelihood of exploitation. Given the widespread use of Drupal in Europe and the critical nature of payment processing, the impact could affect a broad range of sectors including retail, services, and public sector organizations. Additionally, attackers could leverage this vulnerability as a foothold for further network compromise. The absence of known exploits in the wild provides a window for mitigation but also suggests attackers may target unpatched systems opportunistically.

1. Immediate mitigation involves upgrading the Drupal Commerce Paybox module to a patched version once released by the vendor. Monitor Drupal security advisories for updates. 2. Until a patch is available, implement strict network segmentation to isolate e-commerce systems from general user networks and restrict access to trusted IPs only. 3. Deploy Web Application Firewalls (WAF) with custom rules to detect and block anomalous requests that may exploit signature verification flaws. 4. Enable detailed logging and continuous monitoring of payment processing transactions to detect suspicious activities promptly. 5. Conduct thorough code reviews and penetration testing focused on cryptographic signature handling in the payment module. 6. Educate administrators and developers about the vulnerability to ensure rapid response and patch management. 7. Consider temporary disabling or replacing the vulnerable payment module if feasible, or switching to alternative payment gateways with robust security. 8. Implement multi-factor authentication and strong access controls on Drupal administrative interfaces to limit potential damage from compromised sessions.